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#4713630 - 04/01/18 09:24 PM Lubricants_Improving Fuel Efficiency-Legacy Vehicl
Shannow Offline


Registered: 12/12/02
Posts: 40167
Loc: 'Stralia

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#4713665 - 04/01/18 10:19 PM Re: Lubricants_Improving Fuel Efficiency-Legacy Vehicl [Re: Shannow]
spasm3 Offline


Registered: 05/30/10
Posts: 8776
Loc: North Carolina

I found the chart on page 15 interesting
_________________________
13 elantra 68k 5w30 QSUD
03 chevy avalanche76k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 3900 miles m1 0w20/0w40 mix

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#4713682 - 04/01/18 10:46 PM Re: Lubricants_Improving Fuel Efficiency-Legacy Vehicl [Re: spasm3]
Shannow Offline


Registered: 12/12/02
Posts: 40167
Loc: 'Stralia
Yes, big ends aren't supplied lubricant for their full 360 degrees of movement, so while hydrodynamic typically reigns, there is a bit "squeeze film" effect as the load is applied on the firing stroke.

For e.g.


This one is interesting in that it shows standard operation of an engine (grey line), and what happens in de-activated cylinders and those still in service...

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#4713694 - 04/01/18 11:06 PM Re: Lubricants_Improving Fuel Efficiency-Legacy Vehicl [Re: Shannow]
spasm3 Offline


Registered: 05/30/10
Posts: 8776
Loc: North Carolina
I once rebuilt a small block ford 302. I noticed the front main bearing seemed to be worn more than the others. It fired on 1 then 5. So 2 cylinders loading the front bearing first.

( firing order 1 5 4 2 6 3 7 8 )

I changed with firing order with a 351w cam. ( 1 3 7 2 6 5 4 8
_________________________
13 elantra 68k 5w30 QSUD
03 chevy avalanche76k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 3900 miles m1 0w20/0w40 mix

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#4713768 - 04/02/18 04:42 AM Re: Lubricants_Improving Fuel Efficiency-Legacy Vehicl [Re: Shannow]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7485
Loc: S California
Page 12 shows an increase in FEI going from a 10w-30 to a 5w-30. Interesting.

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#4713855 - 04/02/18 07:28 AM Re: Lubricants_Improving Fuel Efficiency-Legacy Vehicl [Re: Shannow]
Cujet Offline


Registered: 02/15/03
Posts: 7238
Loc: Jupiter, Florida
Quote: Use of low-viscosity lubricants, while effective in reducing fuel
consumption, will increase contact severity

Originally Posted By: spasm3

I found the chart on page 15 interesting


Agreed. It's something we've known for some time now. Thin oils and heavily loaded bearings don't go together well.



Edited by Cujet (04/02/18 07:37 AM)
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#4713954 - 04/02/18 09:42 AM Re: Lubricants_Improving Fuel Efficiency-Legacy Vehicl [Re: spasm3]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
Originally Posted By: spasm3

I changed with firing order with a 351w cam. ( 1 3 7 2 6 5 4 8 )


Smallblock Chevy 350 is the same but mirror image
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